code: def test_user_agent_custom(self):
      geocoder = LiveAddress(
          auth_id=self.dummy_id,
          auth_token=self.dummy_token,
          user_agent="my_user_agent/1.0",
      )
      assert geocoder.headers["User-Agent"] == "my_user_agent/1.0"
  
file_path: geopy/test/geocoders/smartystreets.py
imports: from unittest.mock import patch
  import geopy.geocoders
  from geopy.geocoders import LiveAddress
  from test.geocoders.util import BaseTestGeocoder, env
label_desc: Use image node_id 1 for calling the TestUnitLiveAddress obj's underlying member method code with example usage: obj.test_user_agent_custom() without return types